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Vue.js
Why do we need to write key in vue?

Why do we need to write key in vue?

Why do we need to use keys in Vue? The use of keys in Vue is crucial because it: identifies list items for accurate updates. Optimize the diff algorithm for efficient change detection. Cache subcomponents to improve performance. Avoid DOM inconsistencies.

May 02, 2024 pm 08:27 PM
vue组件渲染排列
Why does the for loop in vue need to add a key?

Why does the for loop in vue need to add a key?

In Vue, it is crucial to give each item in a list loop a unique key. Key helps Vue track changes to list items, thereby improving rendering efficiency and performance. It must be unique and stable and added via the :key attribute in the for loop. If you don't specify a key, Vue will use the index as the default key, which may cause performance issues.

May 02, 2024 pm 08:24 PM
vue
The role of created in vue

The role of created in vue

The created life cycle hook in Vue will be executed when the instance is created. Its functions include: 1. Data initialization, setting data before template rendering; 2. Initiating asynchronous operations to ensure completion before rendering; 3. Configuration elements, adding before rendering Event listener or style class; 4. Set watch listener to monitor data attribute changes.

May 02, 2024 pm 08:21 PM
vue
The role of methods in vue

The role of methods in vue

In Vue.js, the methods option is used to define reusable and independent methods from the rendering template. These methods respond to user interactions through event handlers, which can improve code reusability, independence, ease of testing, and event handling capabilities.

May 02, 2024 pm 08:21 PM
vue
How to implement the calculation of function return value in vue

How to implement the calculation of function return value in vue

There are three methods in Vue to calculate function return values: 1. Use the computed attribute; 2. Use methods; 3. Return the function directly.

May 02, 2024 pm 08:21 PM
vue
How to calculate function return value in vue

How to calculate function return value in vue

Vue function return values ​​can be calculated in three ways: Calculated properties: Define a function that calculates a value based on component data. Its return value will be cached and only recalculated when the dependent data changes. Method: Define a function that recalculates the value each time it is called. Template inline calculation: Use JavaScript expressions to perform calculations directly in the template.

May 02, 2024 pm 08:18 PM
vue
How to write methods in methods in vue

How to write methods in methods in vue

In Vue, the steps for writing methods in the Methods option are as follows: Define the methods object in the JavaScript block of components. Methods are defined using function expressions, using camelCase notation and without parameters. Within the method body, use the this keyword to access the component instance. Use the v-on directive to call a method from a template, specifying the method name as an argument. Methods can be synchronous or asynchronous, with asynchronous methods declared using the async keyword.

May 02, 2024 pm 08:18 PM
vue
The role of router in vue

The role of router in vue

Vue Router is the official routing management library for Vue.js, used to manage page navigation in single-page applications. The main functions include: Managing page navigation: allowing users to switch between pages. URL Management: Synchronize application state with URLs. Component reuse: Reuse Vue components in different pages. State management: stores routing information and data. Guards: Execute custom code such as authentication checks.

Apr 30, 2024 am 06:03 AM
vue
How to introduce js into ts in vue

How to introduce js into ts in vue

Methods to introduce JavaScript into Vue: To introduce external scripts: use